Define flocs and state their importance in biological treatment of waste water.

Explanation

### Step-by-Step Solution:

1. **Definition of Flocs**:
- Flocs are aggregates or clumps of bacteria that are associated with fungal filaments. They appear as a mesh-like structure due to the combination of these microorganisms.

2. **Role in Biological Treatment of Wastewater**:
- In the biological treatment of wastewater, particularly during secondary treatment, flocs play a crucial role. This process involves the use of aerobic microbes to decompose organic matter in sewage water.
- The treatment occurs in aeration tanks where constant agitation and aeration promote the growth of these beneficial microbes, leading to the formation of flocs.
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